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Combines & Harvesters Discussion Forum

Do all John Deere 6620's shake?

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andy r

10-12-2012 07:32:39
75.91.151.236



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I recently bought a Deere 6620 with very few problems. But, one thing I notice is that it has a shake. Where you notice it is in the steering column and the three levers (header raise/lower, hydrostatic, and reel height). Also the safety rail on the steps/platform. Everything sort of gets into a rhythm and is shaking back and forth. I have checked all of the bearings, straw walkers and belts. I am running a Deere 216 flex head on it. I do notice that when the head is running that the sickle bar moves back and forth ever so slightly in relationship to the stainless steel flex sheets on the head (less than a 1/8 to 1/4 of an inch). The head drive shafts are running at maximum. I believe the book says no more than 470 rpm and the digital readout in the cab can say 490 at times. Wonder if the stablizer under the the head is getting loose allowing extra movement??? Any ideas are appreciated. I don't know if this is really a problem and certainly is easily tolerated, just don't want to cause any damage. Thank you.

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usetob

10-21-2012 21:04:15
50.126.51.226



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
clean the cylinder real good!



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paul Em

10-14-2012 19:04:50
174.35.226.110



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
Ah thanks JDseller I didn't realize that. If my sprocket wasn't seized I would actually change it between crops!



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paul Em

10-14-2012 12:57:52
174.35.226.110



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
As mentioned make sure you variable speed pulley is as slow as it will go to slow the cutterbar down.
AND I'm not sure if the 6620's are same as the 4420, but we have a larger cog to use on the right side of feeder house to slow down the auger on the grain table.



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JDseller

10-14-2012 13:06:29
208.126.196.144



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 Re: Do all John Deere 6620's shake? in reply to paul Em, 10-14-2012 12:57:52  
That sprocket DOES NOT slow the cross auger down. It has NOTHING to do with the cross auger. That larger sprocket speeds up the feeder house chain. The power transfer on a JD feeder house is down the left side and across the bottom and back up the right side to run the feeder house chain.

Your JD 4420 would be exactly like that too. The small sprocket is for corn and the larger one is for small grains. I usually just leave mine on the larger one.

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larryanderson

10-14-2012 04:10:51
184.21.172.50



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
I have seen combines driven in or had service calls made that were missing one knife on chopper.All combines that are not rotors have some shake but not excessive.Years ago we had an 8820 that we slowed the seperator down as it was speeded up on the later ones and would cause damage to sieves.Straw walker combines are made to shake the grain from the straw.By taking off chopper belt you can diagnose that area and the header shut off will tell you if thats a problem.Definately needs to be checked out or it could cost more than combine is worth.

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Dalet

10-13-2012 18:02:56
184.94.141.146



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
Shut off the header and let us know if it still shakes. It shouldn't.



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8850dave

10-13-2012 04:37:58
198.229.240.134



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
Better check to make sure all the hammers are still in the chopper which if any are missing the whole machine will vibrate. If any missing you have to change them so it can be balanced out again.



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ihman73

10-12-2012 22:39:39
67.43.125.31



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
I was told when I worked on these that the variable speed feederhouse should be run in the slowest speed when running a platform. Otherwise all other ideas here are worth exploring and also make sure you don't have a bent shoe auger(s) as well.



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sideconsole4020guy

10-12-2012 19:35:28
216.249.194.192



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
If you find the bars are full on the back side then you can take out a filler plate and put a few golf balls inside to knock the stuff out while you are combining



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JDseller

10-12-2012 19:34:13
208.126.196.144



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
Does it quit if you shut the header off??? If it does then check your table auger. I have had them bent that would shake the whole combine. If it does not stop then I would check the thrashing cylinder like the others posted.



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Fixerupper

10-12-2012 19:32:15
100.42.82.164



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
I rode in a 6620 combining beans and the first thing I noticed was the shake from the cutterbar. It's been a while ago, cause the combine was near new at the time. A loose wobble box can cause a shake too. Is the shake the same speed as the cutterbar? Does it shake when the head isn't running? Another thing that can cause a shake is the lugs on the front wheels in real firm soil. That had me buffaloed for a while once. Jim

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cydectin

10-12-2012 18:45:00
69.179.130.170



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
Could be dirt in cylinder, header run in wheat without the sickle being locked in the rigid position can and will wear out the pivots for the floating sickle, and might also be the chopper is out of balance.



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jon f mn

10-12-2012 09:56:55
70.197.196.168



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
clean out the cylinder, probly full



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jddriver

10-12-2012 17:09:25
107.202.177.36



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 Re: Do all John Deere 6620's shake? in reply to jon f mn, 10-12-2012 09:56:55  
x2 bars are full of dirt on back side



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568

10-12-2012 09:19:03
69.66.176.121



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 Re: Do all John Deere 6620's shake? in reply to andy r, 10-12-2012 07:32:39  
First thing to check is the shaker bushings in the chaffer/sieve. Very important to replace if they are loose at all as much more damage will occur.



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j hikemper

10-12-2012 19:15:35
50.102.5.142



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 Re: Do all John Deere 6620's shake? in reply to 568, 10-12-2012 09:19:03  
YOU Have a PROBLEM THAT MUSTY BE CORRECTED check for bouncing shafts while runnig at may differet speeds empty, particularly the seive rocking mechanisms ,the cylandar could be out of balance , either from dirt or mismatched replaced rasp bars...



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todd Hamilton

10-13-2012 11:17:11
174.252.151.202



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 Re: Do all John Deere 6620's shake? in reply to j hikemper, 10-12-2012 19:15:35  
Yep a 6620 should be pretty smooth. When cousin traded up to 9400 we were discouraged with the vibration of it.



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